Homework - Using waves

Homework - Using waves & the Doppler effect

How long does it take light to travel from the Sun to Earth?

1. 4.2 light years
2. Just over 8 minutes
3. 150 million kilometers
4. 93 million miles

What is the distance to Proxima Centauri in light years?

1. 150 million kilometers
2. 93 million miles
3. 4.2 light years
4. Just over 8 minutes

What is a light year?

1. 93 million miles
2. 4.2 light years
3. The distance light travels in a year
4. Just over 8 minutes

Compared to the distance from the Sun to Earth, how does the distance to other stars or galaxies compare?

1. Larger
2. 4.2 light years
3. 150 million kilometers
4. Just over 8 minutes

How long does it take light to reach us from the next nearest star, Proxima Centauri?

1. Over four years
2. 150 million kilometers
3. Just over 8 minutes
4. 93 million miles

What type of wave is light?

1. Sound wave
2. Transverse wave
3. Tidal wave
4. Longitudinal wave

What is the speed of light?

1. 2.5 x 10^8 m/s
2. 5.5 x 10^8 m/s
3. 3.2 x 10^8 m/s
4. 4.0 x 10^8 m/s

What can telescopes on satellites provide?

1. X-ray detection
2. Ultraviolet photos
3. Clearer images
4. Infrared vision

What can travel through a vacuum?

1. Seismic waves
2. Light waves
3. Water waves
4. Sound waves

What has changed our understanding of the universe?

1. Discovery of electricity
2. Study of fossils
3. Invention of telescopes
4. Development of cars

What do telescopes help us observe?

1. Underwater creatures
2. Radio waves
3. Magnetic fields
4. EM radiation from stars and planets

Where are telescopes like the Hubble located?

1. Underwater
2. Mountains
3. On satellites
4. Deserts

What type of waves are sound waves?

1. Surface waves
2. Transverse waves
3. Electromagnetic waves
4. Longitudinal waves

How does the wavelength of a sound wave relate to its frequency?

1. Longer wavelength results in lower frequency
2. Longer wavelength results in higher frequency
3. Shorter wavelength results in higher frequency
4. Shorter wavelength results in lower frequency

What effect does a higher frequency sound wave have on pitch?

1. Higher frequency sound wave results in lower pitch
2. Lower frequency sound wave results in higher pitch
3. Higher frequency sound wave results in higher pitch
4. Lower frequency sound wave results in lower pitch

What is necessary for sound waves to travel through?

1. Sound waves need a solid to travel through
2. Sound waves are vacuum traveling
3. Sound waves need a medium to travel through
4. Sound waves need a gas to travel through

What determines the frequency of a sound wave?

1. The speed of the wave
2. The direction of the wave
3. The distance between peaks
4. The amplitude of the wave

The Doppler effect

"Yes its the apparent change in the frequency of a wave caused by relative motion between the source of the wave and the observer".

What is the Doppler effect?

1. The change in wavelength of waves due to motion.
2. The change in frequency of waves due to motion.
3. The change in amplitude of waves due to motion.
4. The change in speed of waves due to motion.

When a source is moving towards an observer, what happens to the frequency of waves?

1. It remains constant.
2. It decreases.
3. It increases.
4. It disappears.

What type of waves are subject to the Doppler effect?

1. Only sound waves.
2. All waves (electromagnetic, sound, water).
3. Only ocean waves.
4. Only light waves.

In the Doppler effect, if a source is moving away from an observer, what happens to the frequency of waves?

1. It remains constant.
2. It increases.
3. It disappears.
4. It decreases.

How is the Doppler effect noticeable in everyday life?

1. When a vehicle with a siren approaches and moves away from a stationary observer.
2. When a vehicle with a silent engine approaches.
3. When a vehicle with no movement is observed.
4. When a vehicle with no sound approaches.